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1# SPDX-License-Identifier: GPL-2.0
2config MMU
3 def_bool y
4
5config CPU_BIG_ENDIAN
6 def_bool y
7
8config LOCKDEP_SUPPORT
9 def_bool y
10
11config STACKTRACE_SUPPORT
12 def_bool y
13
14config ARCH_HAS_ILOG2_U32
15 def_bool n
16
17config ARCH_HAS_ILOG2_U64
18 def_bool n
19
20config GENERIC_HWEIGHT
21 def_bool y
22
23config GENERIC_BUG
24 def_bool y if BUG
25
26config GENERIC_BUG_RELATIVE_POINTERS
27 def_bool y
28
29config GENERIC_LOCKBREAK
30 def_bool y if PREEMPTION
31
32config PGSTE
33 def_bool y if KVM
34
35config AUDIT_ARCH
36 def_bool y
37
38config NO_IOPORT_MAP
39 def_bool y
40
41config PCI_QUIRKS
42 def_bool n
43
44config ARCH_SUPPORTS_UPROBES
45 def_bool y
46
47config KASAN_SHADOW_OFFSET
48 hex
49 depends on KASAN
50 default 0x1C000000000000
51
52config S390
53 def_bool y
54 #
55 # Note: keep this list sorted alphabetically
56 #
57 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
58 select ALTERNATE_USER_ADDRESS_SPACE
59 select ARCH_32BIT_USTAT_F_TINODE
60 select ARCH_BINFMT_ELF_STATE
61 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
62 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
63 select ARCH_ENABLE_MEMORY_HOTREMOVE
64 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
65 select ARCH_HAS_CURRENT_STACK_POINTER
66 select ARCH_HAS_DEBUG_VM_PGTABLE
67 select ARCH_HAS_DEBUG_WX
68 select ARCH_HAS_DEVMEM_IS_ALLOWED
69 select ARCH_HAS_ELF_RANDOMIZE
70 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
71 select ARCH_HAS_FORTIFY_SOURCE
72 select ARCH_HAS_GCOV_PROFILE_ALL
73 select ARCH_HAS_GIGANTIC_PAGE
74 select ARCH_HAS_KCOV
75 select ARCH_HAS_MEMBARRIER_SYNC_CORE
76 select ARCH_HAS_MEM_ENCRYPT
77 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
78 select ARCH_HAS_PTE_SPECIAL
79 select ARCH_HAS_SCALED_CPUTIME
80 select ARCH_HAS_SET_DIRECT_MAP
81 select ARCH_HAS_SET_MEMORY
82 select ARCH_HAS_STRICT_KERNEL_RWX
83 select ARCH_HAS_STRICT_MODULE_RWX
84 select ARCH_HAS_SYSCALL_WRAPPER
85 select ARCH_HAS_UBSAN_SANITIZE_ALL
86 select ARCH_HAS_VDSO_DATA
87 select ARCH_HAVE_NMI_SAFE_CMPXCHG
88 select ARCH_INLINE_READ_LOCK
89 select ARCH_INLINE_READ_LOCK_BH
90 select ARCH_INLINE_READ_LOCK_IRQ
91 select ARCH_INLINE_READ_LOCK_IRQSAVE
92 select ARCH_INLINE_READ_TRYLOCK
93 select ARCH_INLINE_READ_UNLOCK
94 select ARCH_INLINE_READ_UNLOCK_BH
95 select ARCH_INLINE_READ_UNLOCK_IRQ
96 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
97 select ARCH_INLINE_SPIN_LOCK
98 select ARCH_INLINE_SPIN_LOCK_BH
99 select ARCH_INLINE_SPIN_LOCK_IRQ
100 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
101 select ARCH_INLINE_SPIN_TRYLOCK
102 select ARCH_INLINE_SPIN_TRYLOCK_BH
103 select ARCH_INLINE_SPIN_UNLOCK
104 select ARCH_INLINE_SPIN_UNLOCK_BH
105 select ARCH_INLINE_SPIN_UNLOCK_IRQ
106 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
107 select ARCH_INLINE_WRITE_LOCK
108 select ARCH_INLINE_WRITE_LOCK_BH
109 select ARCH_INLINE_WRITE_LOCK_IRQ
110 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
111 select ARCH_INLINE_WRITE_TRYLOCK
112 select ARCH_INLINE_WRITE_UNLOCK
113 select ARCH_INLINE_WRITE_UNLOCK_BH
114 select ARCH_INLINE_WRITE_UNLOCK_IRQ
115 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
116 select ARCH_STACKWALK
117 select ARCH_SUPPORTS_ATOMIC_RMW
118 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
119 select ARCH_SUPPORTS_HUGETLBFS
120 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG
121 select ARCH_SUPPORTS_NUMA_BALANCING
122 select ARCH_SUPPORTS_PER_VMA_LOCK
123 select ARCH_USE_BUILTIN_BSWAP
124 select ARCH_USE_CMPXCHG_LOCKREF
125 select ARCH_USE_SYM_ANNOTATIONS
126 select ARCH_WANTS_NO_INSTR
127 select ARCH_WANT_DEFAULT_BPF_JIT
128 select ARCH_WANT_IPC_PARSE_VERSION
129 select ARCH_WANT_KERNEL_PMD_MKWRITE
130 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
131 select BUILDTIME_TABLE_SORT
132 select CLONE_BACKWARDS2
133 select DCACHE_WORD_ACCESS if !KMSAN
134 select DMA_OPS if PCI
135 select DYNAMIC_FTRACE if FUNCTION_TRACER
136 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC
137 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC
138 select GENERIC_ALLOCATOR
139 select GENERIC_CPU_AUTOPROBE
140 select GENERIC_CPU_VULNERABILITIES
141 select GENERIC_ENTRY
142 select GENERIC_GETTIMEOFDAY
143 select GENERIC_PTDUMP
144 select GENERIC_SMP_IDLE_THREAD
145 select GENERIC_TIME_VSYSCALL
146 select GENERIC_VDSO_TIME_NS
147 select GENERIC_IOREMAP if PCI
148 select HAVE_ALIGNED_STRUCT_PAGE
149 select HAVE_ARCH_AUDITSYSCALL
150 select HAVE_ARCH_JUMP_LABEL
151 select HAVE_ARCH_JUMP_LABEL_RELATIVE
152 select HAVE_ARCH_KASAN
153 select HAVE_ARCH_KASAN_VMALLOC
154 select HAVE_ARCH_KCSAN
155 select HAVE_ARCH_KFENCE
156 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
157 select HAVE_ARCH_SECCOMP_FILTER
158 select HAVE_ARCH_SOFT_DIRTY
159 select HAVE_ARCH_STACKLEAK
160 select HAVE_ARCH_TRACEHOOK
161 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
162 select HAVE_ARCH_VMAP_STACK
163 select HAVE_ASM_MODVERSIONS
164 select HAVE_CMPXCHG_DOUBLE
165 select HAVE_CMPXCHG_LOCAL
166 select HAVE_DEBUG_KMEMLEAK
167 select HAVE_DMA_CONTIGUOUS
168 select HAVE_DYNAMIC_FTRACE
169 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
170 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
171 select HAVE_DYNAMIC_FTRACE_WITH_REGS
172 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
173 select HAVE_EFFICIENT_UNALIGNED_ACCESS
174 select HAVE_FAST_GUP
175 select HAVE_FENTRY
176 select HAVE_FTRACE_MCOUNT_RECORD
177 select HAVE_FUNCTION_ARG_ACCESS_API
178 select HAVE_FUNCTION_ERROR_INJECTION
179 select HAVE_FUNCTION_GRAPH_RETVAL
180 select HAVE_FUNCTION_GRAPH_TRACER
181 select HAVE_FUNCTION_TRACER
182 select HAVE_GCC_PLUGINS
183 select HAVE_GENERIC_VDSO
184 select HAVE_IOREMAP_PROT if PCI
185 select HAVE_KERNEL_BZIP2
186 select HAVE_KERNEL_GZIP
187 select HAVE_KERNEL_LZ4
188 select HAVE_KERNEL_LZMA
189 select HAVE_KERNEL_LZO
190 select HAVE_KERNEL_UNCOMPRESSED
191 select HAVE_KERNEL_XZ
192 select HAVE_KERNEL_ZSTD
193 select HAVE_KPROBES
194 select HAVE_KPROBES_ON_FTRACE
195 select HAVE_KRETPROBES
196 select HAVE_KVM
197 select HAVE_LIVEPATCH
198 select HAVE_MEMBLOCK_PHYS_MAP
199 select HAVE_MOD_ARCH_SPECIFIC
200 select HAVE_NMI
201 select HAVE_NOP_MCOUNT
202 select HAVE_PCI
203 select HAVE_PERF_EVENTS
204 select HAVE_PERF_REGS
205 select HAVE_PERF_USER_STACK_DUMP
206 select HAVE_REGS_AND_STACK_ACCESS_API
207 select HAVE_RELIABLE_STACKTRACE
208 select HAVE_RETHOOK
209 select HAVE_RSEQ
210 select HAVE_SAMPLE_FTRACE_DIRECT
211 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
212 select HAVE_SETUP_PER_CPU_AREA
213 select HAVE_SOFTIRQ_ON_OWN_STACK
214 select HAVE_SYSCALL_TRACEPOINTS
215 select HAVE_VIRT_CPU_ACCOUNTING
216 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
217 select IOMMU_HELPER if PCI
218 select IOMMU_SUPPORT if PCI
219 select MMU_GATHER_MERGE_VMAS
220 select MMU_GATHER_NO_GATHER
221 select MMU_GATHER_RCU_TABLE_FREE
222 select MODULES_USE_ELF_RELA
223 select NEED_DMA_MAP_STATE if PCI
224 select NEED_PER_CPU_EMBED_FIRST_CHUNK
225 select NEED_SG_DMA_LENGTH if PCI
226 select OLD_SIGACTION
227 select OLD_SIGSUSPEND3
228 select PCI_DOMAINS if PCI
229 select PCI_MSI if PCI
230 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
231 select SPARSE_IRQ
232 select SWIOTLB
233 select SYSCTL_EXCEPTION_TRACE
234 select THREAD_INFO_IN_TASK
235 select TRACE_IRQFLAGS_SUPPORT
236 select TTY
237 select USER_STACKTRACE_SUPPORT
238 select VIRT_CPU_ACCOUNTING
239 select ZONE_DMA
240 # Note: keep the above list sorted alphabetically
241
242config SCHED_OMIT_FRAME_POINTER
243 def_bool y
244
245config PGTABLE_LEVELS
246 int
247 default 5
248
249source "kernel/livepatch/Kconfig"
250
251config ARCH_SUPPORTS_KEXEC
252 def_bool y
253
254config ARCH_SUPPORTS_KEXEC_FILE
255 def_bool y
256
257config ARCH_SUPPORTS_KEXEC_SIG
258 def_bool MODULE_SIG_FORMAT
259
260config ARCH_SUPPORTS_KEXEC_PURGATORY
261 def_bool y
262
263config ARCH_SUPPORTS_CRASH_DUMP
264 def_bool y
265 help
266 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this.
267 This option also enables s390 zfcpdump.
268 See also <file:Documentation/arch/s390/zfcpdump.rst>
269
270menu "Processor type and features"
271
272config HAVE_MARCH_Z10_FEATURES
273 def_bool n
274
275config HAVE_MARCH_Z196_FEATURES
276 def_bool n
277 select HAVE_MARCH_Z10_FEATURES
278
279config HAVE_MARCH_ZEC12_FEATURES
280 def_bool n
281 select HAVE_MARCH_Z196_FEATURES
282
283config HAVE_MARCH_Z13_FEATURES
284 def_bool n
285 select HAVE_MARCH_ZEC12_FEATURES
286
287config HAVE_MARCH_Z14_FEATURES
288 def_bool n
289 select HAVE_MARCH_Z13_FEATURES
290
291config HAVE_MARCH_Z15_FEATURES
292 def_bool n
293 select HAVE_MARCH_Z14_FEATURES
294
295config HAVE_MARCH_Z16_FEATURES
296 def_bool n
297 select HAVE_MARCH_Z15_FEATURES
298
299choice
300 prompt "Processor type"
301 default MARCH_Z196
302
303config MARCH_Z10
304 bool "IBM System z10"
305 select HAVE_MARCH_Z10_FEATURES
306 depends on $(cc-option,-march=z10)
307 help
308 Select this to enable optimizations for IBM System z10 (2097 and 2098
309 series). This is the oldest machine generation currently supported.
310
311config MARCH_Z196
312 bool "IBM zEnterprise 114 and 196"
313 select HAVE_MARCH_Z196_FEATURES
314 depends on $(cc-option,-march=z196)
315 help
316 Select this to enable optimizations for IBM zEnterprise 114 and 196
317 (2818 and 2817 series). The kernel will be slightly faster but will
318 not work on older machines.
319
320config MARCH_ZEC12
321 bool "IBM zBC12 and zEC12"
322 select HAVE_MARCH_ZEC12_FEATURES
323 depends on $(cc-option,-march=zEC12)
324 help
325 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
326 2827 series). The kernel will be slightly faster but will not work on
327 older machines.
328
329config MARCH_Z13
330 bool "IBM z13s and z13"
331 select HAVE_MARCH_Z13_FEATURES
332 depends on $(cc-option,-march=z13)
333 help
334 Select this to enable optimizations for IBM z13s and z13 (2965 and
335 2964 series). The kernel will be slightly faster but will not work on
336 older machines.
337
338config MARCH_Z14
339 bool "IBM z14 ZR1 and z14"
340 select HAVE_MARCH_Z14_FEATURES
341 depends on $(cc-option,-march=z14)
342 help
343 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
344 and 3906 series). The kernel will be slightly faster but will not
345 work on older machines.
346
347config MARCH_Z15
348 bool "IBM z15"
349 select HAVE_MARCH_Z15_FEATURES
350 depends on $(cc-option,-march=z15)
351 help
352 Select this to enable optimizations for IBM z15 (8562
353 and 8561 series). The kernel will be slightly faster but will not
354 work on older machines.
355
356config MARCH_Z16
357 bool "IBM z16"
358 select HAVE_MARCH_Z16_FEATURES
359 depends on $(cc-option,-march=z16)
360 help
361 Select this to enable optimizations for IBM z16 (3931 and
362 3932 series).
363
364endchoice
365
366config MARCH_Z10_TUNE
367 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
368
369config MARCH_Z196_TUNE
370 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
371
372config MARCH_ZEC12_TUNE
373 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
374
375config MARCH_Z13_TUNE
376 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
377
378config MARCH_Z14_TUNE
379 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
380
381config MARCH_Z15_TUNE
382 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
383
384config MARCH_Z16_TUNE
385 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
386
387choice
388 prompt "Tune code generation"
389 default TUNE_DEFAULT
390 help
391 Cause the compiler to tune (-mtune) the generated code for a machine.
392 This will make the code run faster on the selected machine but
393 somewhat slower on other machines.
394 This option only changes how the compiler emits instructions, not the
395 selection of instructions itself, so the resulting kernel will run on
396 all other machines.
397
398config TUNE_DEFAULT
399 bool "Default"
400 help
401 Tune the generated code for the target processor for which the kernel
402 will be compiled.
403
404config TUNE_Z10
405 bool "IBM System z10"
406
407config TUNE_Z196
408 bool "IBM zEnterprise 114 and 196"
409 depends on $(cc-option,-mtune=z196)
410
411config TUNE_ZEC12
412 bool "IBM zBC12 and zEC12"
413 depends on $(cc-option,-mtune=zEC12)
414
415config TUNE_Z13
416 bool "IBM z13s and z13"
417 depends on $(cc-option,-mtune=z13)
418
419config TUNE_Z14
420 bool "IBM z14 ZR1 and z14"
421 depends on $(cc-option,-mtune=z14)
422
423config TUNE_Z15
424 bool "IBM z15"
425 depends on $(cc-option,-mtune=z15)
426
427config TUNE_Z16
428 bool "IBM z16"
429 depends on $(cc-option,-mtune=z16)
430
431endchoice
432
433config 64BIT
434 def_bool y
435
436config COMMAND_LINE_SIZE
437 int "Maximum size of kernel command line"
438 default 4096
439 range 896 1048576
440 help
441 This allows you to specify the maximum length of the kernel command
442 line.
443
444config COMPAT
445 def_bool n
446 prompt "Kernel support for 31 bit emulation"
447 select ARCH_WANT_OLD_COMPAT_IPC
448 select COMPAT_OLD_SIGACTION
449 select HAVE_UID16
450 depends on MULTIUSER
451 depends on !CC_IS_CLANG
452 help
453 Select this option if you want to enable your system kernel to
454 handle system-calls from ELF binaries for 31 bit ESA. This option
455 (and some other stuff like libraries and such) is needed for
456 executing 31 bit applications.
457
458 If unsure say N.
459
460config SMP
461 def_bool y
462
463config NR_CPUS
464 int "Maximum number of CPUs (2-512)"
465 range 2 512
466 default "64"
467 help
468 This allows you to specify the maximum number of CPUs which this
469 kernel will support. The maximum supported value is 512 and the
470 minimum value which makes sense is 2.
471
472 This is purely to save memory - each supported CPU adds
473 approximately sixteen kilobytes to the kernel image.
474
475config HOTPLUG_CPU
476 def_bool y
477
478config NUMA
479 bool "NUMA support"
480 depends on SCHED_TOPOLOGY
481 default n
482 help
483 Enable NUMA support
484
485 This option adds NUMA support to the kernel.
486
487config NODES_SHIFT
488 int
489 depends on NUMA
490 default "1"
491
492config SCHED_SMT
493 def_bool n
494
495config SCHED_MC
496 def_bool n
497
498config SCHED_TOPOLOGY
499 def_bool y
500 prompt "Topology scheduler support"
501 select SCHED_SMT
502 select SCHED_MC
503 help
504 Topology scheduler support improves the CPU scheduler's decision
505 making when dealing with machines that have multi-threading,
506 multiple cores or multiple books.
507
508source "kernel/Kconfig.hz"
509
510config CERT_STORE
511 bool "Get user certificates via DIAG320"
512 depends on KEYS
513 select CRYPTO_LIB_SHA256
514 help
515 Enable this option if you want to access user-provided secure boot
516 certificates via DIAG 0x320.
517
518 These certificates will be made available via the keyring named
519 'cert_store'.
520
521config KERNEL_NOBP
522 def_bool n
523 prompt "Enable modified branch prediction for the kernel by default"
524 help
525 If this option is selected the kernel will switch to a modified
526 branch prediction mode if the firmware interface is available.
527 The modified branch prediction mode improves the behaviour in
528 regard to speculative execution.
529
530 With the option enabled the kernel parameter "nobp=0" or "nospec"
531 can be used to run the kernel in the normal branch prediction mode.
532
533 With the option disabled the modified branch prediction mode is
534 enabled with the "nobp=1" kernel parameter.
535
536 If unsure, say N.
537
538config EXPOLINE
539 def_bool n
540 depends on $(cc-option,-mindirect-branch=thunk)
541 prompt "Avoid speculative indirect branches in the kernel"
542 help
543 Compile the kernel with the expoline compiler options to guard
544 against kernel-to-user data leaks by avoiding speculative indirect
545 branches.
546 Requires a compiler with -mindirect-branch=thunk support for full
547 protection. The kernel may run slower.
548
549 If unsure, say N.
550
551config EXPOLINE_EXTERN
552 def_bool n
553 depends on EXPOLINE
554 depends on CC_IS_GCC && GCC_VERSION >= 110200
555 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
556 prompt "Generate expolines as extern functions."
557 help
558 This option is required for some tooling like kpatch. The kernel is
559 compiled with -mindirect-branch=thunk-extern and requires a newer
560 compiler.
561
562 If unsure, say N.
563
564choice
565 prompt "Expoline default"
566 depends on EXPOLINE
567 default EXPOLINE_FULL
568
569config EXPOLINE_OFF
570 bool "spectre_v2=off"
571
572config EXPOLINE_AUTO
573 bool "spectre_v2=auto"
574
575config EXPOLINE_FULL
576 bool "spectre_v2=on"
577
578endchoice
579
580config RELOCATABLE
581 def_bool y
582 help
583 This builds a kernel image that retains relocation information
584 so it can be loaded at an arbitrary address.
585 The kernel is linked as a position-independent executable (PIE)
586 and contains dynamic relocations which are processed early in the
587 bootup process.
588 The relocations make the kernel image about 15% larger (compressed
589 10%), but are discarded at runtime.
590 Note: this option exists only for documentation purposes, please do
591 not remove it.
592
593config RANDOMIZE_BASE
594 bool "Randomize the address of the kernel image (KASLR)"
595 default y
596 help
597 In support of Kernel Address Space Layout Randomization (KASLR),
598 this randomizes the address at which the kernel image is loaded,
599 as a security feature that deters exploit attempts relying on
600 knowledge of the location of kernel internals.
601
602endmenu
603
604menu "Memory setup"
605
606config ARCH_SPARSEMEM_ENABLE
607 def_bool y
608 select SPARSEMEM_VMEMMAP_ENABLE
609 select SPARSEMEM_VMEMMAP
610
611config ARCH_SPARSEMEM_DEFAULT
612 def_bool y
613
614config MAX_PHYSMEM_BITS
615 int "Maximum size of supported physical memory in bits (42-53)"
616 range 42 53
617 default "46"
618 help
619 This option specifies the maximum supported size of physical memory
620 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
621 Increasing the number of bits also increases the kernel image size.
622 By default 46 bits (64TB) are supported.
623
624config CHECK_STACK
625 def_bool y
626 depends on !VMAP_STACK
627 prompt "Detect kernel stack overflow"
628 help
629 This option enables the compiler option -mstack-guard and
630 -mstack-size if they are available. If the compiler supports them
631 it will emit additional code to each function prolog to trigger
632 an illegal operation if the kernel stack is about to overflow.
633
634 Say N if you are unsure.
635
636config STACK_GUARD
637 int "Size of the guard area (128-1024)"
638 range 128 1024
639 depends on CHECK_STACK
640 default "256"
641 help
642 This allows you to specify the size of the guard area at the lower
643 end of the kernel stack. If the kernel stack points into the guard
644 area on function entry an illegal operation is triggered. The size
645 needs to be a power of 2. Please keep in mind that the size of an
646 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
647 The minimum size for the stack guard should be 256 for 31 bit and
648 512 for 64 bit.
649
650endmenu
651
652menu "I/O subsystem"
653
654config QDIO
655 def_tristate y
656 prompt "QDIO support"
657 help
658 This driver provides the Queued Direct I/O base support for
659 IBM System z.
660
661 To compile this driver as a module, choose M here: the
662 module will be called qdio.
663
664 If unsure, say Y.
665
666if PCI
667
668config PCI_NR_FUNCTIONS
669 int "Maximum number of PCI functions (1-4096)"
670 range 1 4096
671 default "512"
672 help
673 This allows you to specify the maximum number of PCI functions which
674 this kernel will support.
675
676endif # PCI
677
678config HAS_IOMEM
679 def_bool PCI
680
681config CHSC_SCH
682 def_tristate m
683 prompt "Support for CHSC subchannels"
684 help
685 This driver allows usage of CHSC subchannels. A CHSC subchannel
686 is usually present on LPAR only.
687 The driver creates a device /dev/chsc, which may be used to
688 obtain I/O configuration information about the machine and
689 to issue asynchronous chsc commands (DANGEROUS).
690 You will usually only want to use this interface on a special
691 LPAR designated for system management.
692
693 To compile this driver as a module, choose M here: the
694 module will be called chsc_sch.
695
696 If unsure, say N.
697
698config SCM_BUS
699 def_bool y
700 prompt "SCM bus driver"
701 help
702 Bus driver for Storage Class Memory.
703
704config EADM_SCH
705 def_tristate m
706 prompt "Support for EADM subchannels"
707 depends on SCM_BUS
708 help
709 This driver allows usage of EADM subchannels. EADM subchannels act
710 as a communication vehicle for SCM increments.
711
712 To compile this driver as a module, choose M here: the
713 module will be called eadm_sch.
714
715config VFIO_CCW
716 def_tristate n
717 prompt "Support for VFIO-CCW subchannels"
718 depends on VFIO
719 select VFIO_MDEV
720 help
721 This driver allows usage of I/O subchannels via VFIO-CCW.
722
723 To compile this driver as a module, choose M here: the
724 module will be called vfio_ccw.
725
726config VFIO_AP
727 def_tristate n
728 prompt "VFIO support for AP devices"
729 depends on KVM
730 depends on VFIO
731 depends on ZCRYPT
732 select VFIO_MDEV
733 help
734 This driver grants access to Adjunct Processor (AP) devices
735 via the VFIO mediated device interface.
736
737 To compile this driver as a module, choose M here: the module
738 will be called vfio_ap.
739
740endmenu
741
742config CCW
743 def_bool y
744
745config HAVE_PNETID
746 tristate
747 default (SMC || CCWGROUP)
748
749menu "Virtualization"
750
751config PROTECTED_VIRTUALIZATION_GUEST
752 def_bool n
753 prompt "Protected virtualization guest support"
754 help
755 Select this option, if you want to be able to run this
756 kernel as a protected virtualization KVM guest.
757 Protected virtualization capable machines have a mini hypervisor
758 located at machine level (an ultravisor). With help of the
759 Ultravisor, KVM will be able to run "protected" VMs, special
760 VMs whose memory and management data are unavailable to KVM.
761
762config PFAULT
763 def_bool y
764 prompt "Pseudo page fault support"
765 help
766 Select this option, if you want to use PFAULT pseudo page fault
767 handling under VM. If running native or in LPAR, this option
768 has no effect. If your VM does not support PFAULT, PAGEEX
769 pseudo page fault handling will be used.
770 Note that VM 4.2 supports PFAULT but has a bug in its
771 implementation that causes some problems.
772 Everybody who wants to run Linux under VM != VM4.2 should select
773 this option.
774
775config CMM
776 def_tristate n
777 prompt "Cooperative memory management"
778 help
779 Select this option, if you want to enable the kernel interface
780 to reduce the memory size of the system. This is accomplished
781 by allocating pages of memory and put them "on hold". This only
782 makes sense for a system running under VM where the unused pages
783 will be reused by VM for other guest systems. The interface
784 allows an external monitor to balance memory of many systems.
785 Everybody who wants to run Linux under VM should select this
786 option.
787
788config CMM_IUCV
789 def_bool y
790 prompt "IUCV special message interface to cooperative memory management"
791 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
792 help
793 Select this option to enable the special message interface to
794 the cooperative memory management.
795
796config APPLDATA_BASE
797 def_bool n
798 prompt "Linux - VM Monitor Stream, base infrastructure"
799 depends on PROC_SYSCTL
800 help
801 This provides a kernel interface for creating and updating z/VM APPLDATA
802 monitor records. The monitor records are updated at certain time
803 intervals, once the timer is started.
804 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
805 i.e. enables or disables monitoring on the Linux side.
806 A custom interval value (in seconds) can be written to
807 /proc/appldata/interval.
808
809 Defaults are 60 seconds interval and timer off.
810 The /proc entries can also be read from, showing the current settings.
811
812config APPLDATA_MEM
813 def_tristate m
814 prompt "Monitor memory management statistics"
815 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
816 help
817 This provides memory management related data to the Linux - VM Monitor
818 Stream, like paging/swapping rate, memory utilisation, etc.
819 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
820 APPLDATA monitor record, i.e. enables or disables monitoring this record
821 on the z/VM side.
822
823 Default is disabled.
824 The /proc entry can also be read from, showing the current settings.
825
826 This can also be compiled as a module, which will be called
827 appldata_mem.o.
828
829config APPLDATA_OS
830 def_tristate m
831 prompt "Monitor OS statistics"
832 depends on APPLDATA_BASE
833 help
834 This provides OS related data to the Linux - VM Monitor Stream, like
835 CPU utilisation, etc.
836 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
837 APPLDATA monitor record, i.e. enables or disables monitoring this record
838 on the z/VM side.
839
840 Default is disabled.
841 This can also be compiled as a module, which will be called
842 appldata_os.o.
843
844config APPLDATA_NET_SUM
845 def_tristate m
846 prompt "Monitor overall network statistics"
847 depends on APPLDATA_BASE && NET
848 help
849 This provides network related data to the Linux - VM Monitor Stream,
850 currently there is only a total sum of network I/O statistics, no
851 per-interface data.
852 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
853 APPLDATA monitor record, i.e. enables or disables monitoring this record
854 on the z/VM side.
855
856 Default is disabled.
857 This can also be compiled as a module, which will be called
858 appldata_net_sum.o.
859
860config S390_HYPFS
861 def_bool y
862 prompt "s390 hypervisor information"
863 help
864 This provides several binary files at (debugfs)/s390_hypfs/ to
865 provide accounting information in an s390 hypervisor environment.
866
867config S390_HYPFS_FS
868 def_bool n
869 prompt "s390 hypervisor file system support"
870 select SYS_HYPERVISOR
871 depends on S390_HYPFS
872 help
873 This is a virtual file system intended to provide accounting
874 information in an s390 hypervisor environment. This file system
875 is deprecated and should not be used.
876
877 Say N if you are unsure.
878
879source "arch/s390/kvm/Kconfig"
880
881config S390_GUEST
882 def_bool y
883 prompt "s390 support for virtio devices"
884 select TTY
885 select VIRTUALIZATION
886 select VIRTIO
887 help
888 Enabling this option adds support for virtio based paravirtual device
889 drivers on s390.
890
891 Select this option if you want to run the kernel as a guest under
892 the KVM hypervisor.
893
894endmenu
895
896config S390_MODULES_SANITY_TEST_HELPERS
897 def_bool n
898
899menu "Selftests"
900
901config S390_UNWIND_SELFTEST
902 def_tristate n
903 depends on KUNIT
904 default KUNIT_ALL_TESTS
905 prompt "Test unwind functions"
906 help
907 This option enables s390 specific stack unwinder testing kernel
908 module. This option is not useful for distributions or general
909 kernels, but only for kernel developers working on architecture code.
910
911 Say N if you are unsure.
912
913config S390_KPROBES_SANITY_TEST
914 def_tristate n
915 prompt "Enable s390 specific kprobes tests"
916 depends on KPROBES
917 depends on KUNIT
918 help
919 This option enables an s390 specific kprobes test module. This option
920 is not useful for distributions or general kernels, but only for kernel
921 developers working on architecture code.
922
923 Say N if you are unsure.
924
925config S390_MODULES_SANITY_TEST
926 def_tristate n
927 depends on KUNIT
928 default KUNIT_ALL_TESTS
929 prompt "Enable s390 specific modules tests"
930 select S390_MODULES_SANITY_TEST_HELPERS
931 help
932 This option enables an s390 specific modules test. This option is
933 not useful for distributions or general kernels, but only for
934 kernel developers working on architecture code.
935
936 Say N if you are unsure.
937endmenu
1# SPDX-License-Identifier: GPL-2.0
2config MMU
3 def_bool y
4
5config CPU_BIG_ENDIAN
6 def_bool y
7
8config LOCKDEP_SUPPORT
9 def_bool y
10
11config STACKTRACE_SUPPORT
12 def_bool y
13
14config ARCH_HAS_ILOG2_U32
15 def_bool n
16
17config ARCH_HAS_ILOG2_U64
18 def_bool n
19
20config GENERIC_HWEIGHT
21 def_bool y
22
23config GENERIC_BUG
24 def_bool y if BUG
25
26config GENERIC_BUG_RELATIVE_POINTERS
27 def_bool y
28
29config GENERIC_CSUM
30 bool
31 default y if KASAN
32
33config GENERIC_LOCKBREAK
34 def_bool y if PREEMPTION
35
36config PGSTE
37 def_bool y if KVM
38
39config AUDIT_ARCH
40 def_bool y
41
42config NO_IOPORT_MAP
43 def_bool y
44
45config PCI_QUIRKS
46 def_bool n
47
48config ARCH_SUPPORTS_UPROBES
49 def_bool y
50
51config KASAN_SHADOW_OFFSET
52 hex
53 depends on KASAN
54 default 0x1C000000000000
55
56config S390
57 def_bool y
58 #
59 # Note: keep this list sorted alphabetically
60 #
61 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
62 select ALTERNATE_USER_ADDRESS_SPACE
63 select ARCH_32BIT_USTAT_F_TINODE
64 select ARCH_BINFMT_ELF_STATE
65 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
66 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
67 select ARCH_ENABLE_MEMORY_HOTREMOVE
68 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
69 select ARCH_HAS_CURRENT_STACK_POINTER
70 select ARCH_HAS_DEBUG_VM_PGTABLE
71 select ARCH_HAS_DEBUG_WX
72 select ARCH_HAS_DEVMEM_IS_ALLOWED
73 select ARCH_HAS_ELF_RANDOMIZE
74 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
75 select ARCH_HAS_FORTIFY_SOURCE
76 select ARCH_HAS_GCOV_PROFILE_ALL
77 select ARCH_HAS_GIGANTIC_PAGE
78 select ARCH_HAS_KCOV
79 select ARCH_HAS_MEM_ENCRYPT
80 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
81 select ARCH_HAS_PTE_SPECIAL
82 select ARCH_HAS_SCALED_CPUTIME
83 select ARCH_HAS_SET_MEMORY
84 select ARCH_HAS_STRICT_KERNEL_RWX
85 select ARCH_HAS_STRICT_MODULE_RWX
86 select ARCH_HAS_SYSCALL_WRAPPER
87 select ARCH_HAS_UBSAN_SANITIZE_ALL
88 select ARCH_HAS_VDSO_DATA
89 select ARCH_HAVE_NMI_SAFE_CMPXCHG
90 select ARCH_INLINE_READ_LOCK
91 select ARCH_INLINE_READ_LOCK_BH
92 select ARCH_INLINE_READ_LOCK_IRQ
93 select ARCH_INLINE_READ_LOCK_IRQSAVE
94 select ARCH_INLINE_READ_TRYLOCK
95 select ARCH_INLINE_READ_UNLOCK
96 select ARCH_INLINE_READ_UNLOCK_BH
97 select ARCH_INLINE_READ_UNLOCK_IRQ
98 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
99 select ARCH_INLINE_SPIN_LOCK
100 select ARCH_INLINE_SPIN_LOCK_BH
101 select ARCH_INLINE_SPIN_LOCK_IRQ
102 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
103 select ARCH_INLINE_SPIN_TRYLOCK
104 select ARCH_INLINE_SPIN_TRYLOCK_BH
105 select ARCH_INLINE_SPIN_UNLOCK
106 select ARCH_INLINE_SPIN_UNLOCK_BH
107 select ARCH_INLINE_SPIN_UNLOCK_IRQ
108 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
109 select ARCH_INLINE_WRITE_LOCK
110 select ARCH_INLINE_WRITE_LOCK_BH
111 select ARCH_INLINE_WRITE_LOCK_IRQ
112 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
113 select ARCH_INLINE_WRITE_TRYLOCK
114 select ARCH_INLINE_WRITE_UNLOCK
115 select ARCH_INLINE_WRITE_UNLOCK_BH
116 select ARCH_INLINE_WRITE_UNLOCK_IRQ
117 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
118 select ARCH_STACKWALK
119 select ARCH_SUPPORTS_ATOMIC_RMW
120 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
121 select ARCH_SUPPORTS_HUGETLBFS
122 select ARCH_SUPPORTS_NUMA_BALANCING
123 select ARCH_USE_BUILTIN_BSWAP
124 select ARCH_USE_CMPXCHG_LOCKREF
125 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
126 select ARCH_WANTS_NO_INSTR
127 select ARCH_WANT_DEFAULT_BPF_JIT
128 select ARCH_WANT_IPC_PARSE_VERSION
129 select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
130 select BUILDTIME_TABLE_SORT
131 select CLONE_BACKWARDS2
132 select DMA_OPS if PCI
133 select DYNAMIC_FTRACE if FUNCTION_TRACER
134 select GCC12_NO_ARRAY_BOUNDS
135 select GENERIC_ALLOCATOR
136 select GENERIC_CPU_AUTOPROBE
137 select GENERIC_CPU_VULNERABILITIES
138 select GENERIC_ENTRY
139 select GENERIC_GETTIMEOFDAY
140 select GENERIC_PTDUMP
141 select GENERIC_SMP_IDLE_THREAD
142 select GENERIC_TIME_VSYSCALL
143 select GENERIC_VDSO_TIME_NS
144 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
145 select HAVE_ARCH_AUDITSYSCALL
146 select HAVE_ARCH_JUMP_LABEL
147 select HAVE_ARCH_JUMP_LABEL_RELATIVE
148 select HAVE_ARCH_KASAN
149 select HAVE_ARCH_KASAN_VMALLOC
150 select HAVE_ARCH_KCSAN
151 select HAVE_ARCH_KFENCE
152 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
153 select HAVE_ARCH_SECCOMP_FILTER
154 select HAVE_ARCH_SOFT_DIRTY
155 select HAVE_ARCH_TRACEHOOK
156 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
157 select HAVE_ARCH_VMAP_STACK
158 select HAVE_ASM_MODVERSIONS
159 select HAVE_CMPXCHG_DOUBLE
160 select HAVE_CMPXCHG_LOCAL
161 select HAVE_DEBUG_KMEMLEAK
162 select HAVE_DMA_CONTIGUOUS
163 select HAVE_DYNAMIC_FTRACE
164 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
165 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
166 select HAVE_DYNAMIC_FTRACE_WITH_REGS
167 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
168 select HAVE_EFFICIENT_UNALIGNED_ACCESS
169 select HAVE_FAST_GUP
170 select HAVE_FENTRY
171 select HAVE_FTRACE_MCOUNT_RECORD
172 select HAVE_FUNCTION_ARG_ACCESS_API
173 select HAVE_FUNCTION_ERROR_INJECTION
174 select HAVE_FUNCTION_GRAPH_TRACER
175 select HAVE_FUNCTION_TRACER
176 select HAVE_GCC_PLUGINS
177 select HAVE_GENERIC_VDSO
178 select HAVE_IOREMAP_PROT if PCI
179 select HAVE_KERNEL_BZIP2
180 select HAVE_KERNEL_GZIP
181 select HAVE_KERNEL_LZ4
182 select HAVE_KERNEL_LZMA
183 select HAVE_KERNEL_LZO
184 select HAVE_KERNEL_UNCOMPRESSED
185 select HAVE_KERNEL_XZ
186 select HAVE_KERNEL_ZSTD
187 select HAVE_KPROBES
188 select HAVE_KPROBES_ON_FTRACE
189 select HAVE_KRETPROBES
190 select HAVE_KVM
191 select HAVE_LIVEPATCH
192 select HAVE_MEMBLOCK_PHYS_MAP
193 select HAVE_MOD_ARCH_SPECIFIC
194 select HAVE_NMI
195 select HAVE_NOP_MCOUNT
196 select HAVE_PCI
197 select HAVE_PERF_EVENTS
198 select HAVE_PERF_REGS
199 select HAVE_PERF_USER_STACK_DUMP
200 select HAVE_REGS_AND_STACK_ACCESS_API
201 select HAVE_RELIABLE_STACKTRACE
202 select HAVE_RSEQ
203 select HAVE_SAMPLE_FTRACE_DIRECT
204 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
205 select HAVE_SETUP_PER_CPU_AREA
206 select HAVE_SOFTIRQ_ON_OWN_STACK
207 select HAVE_SYSCALL_TRACEPOINTS
208 select HAVE_VIRT_CPU_ACCOUNTING
209 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
210 select IOMMU_HELPER if PCI
211 select IOMMU_SUPPORT if PCI
212 select MMU_GATHER_NO_GATHER
213 select MMU_GATHER_RCU_TABLE_FREE
214 select MMU_GATHER_MERGE_VMAS
215 select MODULES_USE_ELF_RELA
216 select NEED_DMA_MAP_STATE if PCI
217 select NEED_PER_CPU_EMBED_FIRST_CHUNK
218 select NEED_SG_DMA_LENGTH if PCI
219 select OLD_SIGACTION
220 select OLD_SIGSUSPEND3
221 select PCI_DOMAINS if PCI
222 select PCI_MSI if PCI
223 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
224 select SPARSE_IRQ
225 select SWIOTLB
226 select SYSCTL_EXCEPTION_TRACE
227 select THREAD_INFO_IN_TASK
228 select TRACE_IRQFLAGS_SUPPORT
229 select TTY
230 select VIRT_CPU_ACCOUNTING
231 select ZONE_DMA
232 # Note: keep the above list sorted alphabetically
233
234config SCHED_OMIT_FRAME_POINTER
235 def_bool y
236
237config PGTABLE_LEVELS
238 int
239 default 5
240
241source "kernel/livepatch/Kconfig"
242
243menu "Processor type and features"
244
245config HAVE_MARCH_Z10_FEATURES
246 def_bool n
247
248config HAVE_MARCH_Z196_FEATURES
249 def_bool n
250 select HAVE_MARCH_Z10_FEATURES
251
252config HAVE_MARCH_ZEC12_FEATURES
253 def_bool n
254 select HAVE_MARCH_Z196_FEATURES
255
256config HAVE_MARCH_Z13_FEATURES
257 def_bool n
258 select HAVE_MARCH_ZEC12_FEATURES
259
260config HAVE_MARCH_Z14_FEATURES
261 def_bool n
262 select HAVE_MARCH_Z13_FEATURES
263
264config HAVE_MARCH_Z15_FEATURES
265 def_bool n
266 select HAVE_MARCH_Z14_FEATURES
267
268config HAVE_MARCH_Z16_FEATURES
269 def_bool n
270 select HAVE_MARCH_Z15_FEATURES
271
272choice
273 prompt "Processor type"
274 default MARCH_Z196
275
276config MARCH_Z10
277 bool "IBM System z10"
278 select HAVE_MARCH_Z10_FEATURES
279 depends on $(cc-option,-march=z10)
280 help
281 Select this to enable optimizations for IBM System z10 (2097 and 2098
282 series). This is the oldest machine generation currently supported.
283
284config MARCH_Z196
285 bool "IBM zEnterprise 114 and 196"
286 select HAVE_MARCH_Z196_FEATURES
287 depends on $(cc-option,-march=z196)
288 help
289 Select this to enable optimizations for IBM zEnterprise 114 and 196
290 (2818 and 2817 series). The kernel will be slightly faster but will
291 not work on older machines.
292
293config MARCH_ZEC12
294 bool "IBM zBC12 and zEC12"
295 select HAVE_MARCH_ZEC12_FEATURES
296 depends on $(cc-option,-march=zEC12)
297 help
298 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
299 2827 series). The kernel will be slightly faster but will not work on
300 older machines.
301
302config MARCH_Z13
303 bool "IBM z13s and z13"
304 select HAVE_MARCH_Z13_FEATURES
305 depends on $(cc-option,-march=z13)
306 help
307 Select this to enable optimizations for IBM z13s and z13 (2965 and
308 2964 series). The kernel will be slightly faster but will not work on
309 older machines.
310
311config MARCH_Z14
312 bool "IBM z14 ZR1 and z14"
313 select HAVE_MARCH_Z14_FEATURES
314 depends on $(cc-option,-march=z14)
315 help
316 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
317 and 3906 series). The kernel will be slightly faster but will not
318 work on older machines.
319
320config MARCH_Z15
321 bool "IBM z15"
322 select HAVE_MARCH_Z15_FEATURES
323 depends on $(cc-option,-march=z15)
324 help
325 Select this to enable optimizations for IBM z15 (8562
326 and 8561 series). The kernel will be slightly faster but will not
327 work on older machines.
328
329config MARCH_Z16
330 bool "IBM z16"
331 select HAVE_MARCH_Z16_FEATURES
332 depends on $(cc-option,-march=z16)
333 help
334 Select this to enable optimizations for IBM z16 (3931 and
335 3932 series).
336
337endchoice
338
339config MARCH_Z10_TUNE
340 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
341
342config MARCH_Z196_TUNE
343 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
344
345config MARCH_ZEC12_TUNE
346 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
347
348config MARCH_Z13_TUNE
349 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
350
351config MARCH_Z14_TUNE
352 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
353
354config MARCH_Z15_TUNE
355 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
356
357config MARCH_Z16_TUNE
358 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
359
360choice
361 prompt "Tune code generation"
362 default TUNE_DEFAULT
363 help
364 Cause the compiler to tune (-mtune) the generated code for a machine.
365 This will make the code run faster on the selected machine but
366 somewhat slower on other machines.
367 This option only changes how the compiler emits instructions, not the
368 selection of instructions itself, so the resulting kernel will run on
369 all other machines.
370
371config TUNE_DEFAULT
372 bool "Default"
373 help
374 Tune the generated code for the target processor for which the kernel
375 will be compiled.
376
377config TUNE_Z10
378 bool "IBM System z10"
379
380config TUNE_Z196
381 bool "IBM zEnterprise 114 and 196"
382 depends on $(cc-option,-mtune=z196)
383
384config TUNE_ZEC12
385 bool "IBM zBC12 and zEC12"
386 depends on $(cc-option,-mtune=zEC12)
387
388config TUNE_Z13
389 bool "IBM z13s and z13"
390 depends on $(cc-option,-mtune=z13)
391
392config TUNE_Z14
393 bool "IBM z14 ZR1 and z14"
394 depends on $(cc-option,-mtune=z14)
395
396config TUNE_Z15
397 bool "IBM z15"
398 depends on $(cc-option,-mtune=z15)
399
400config TUNE_Z16
401 bool "IBM z16"
402 depends on $(cc-option,-mtune=z16)
403
404endchoice
405
406config 64BIT
407 def_bool y
408
409config COMMAND_LINE_SIZE
410 int "Maximum size of kernel command line"
411 default 4096
412 range 896 1048576
413 help
414 This allows you to specify the maximum length of the kernel command
415 line.
416
417config COMPAT
418 def_bool y
419 prompt "Kernel support for 31 bit emulation"
420 select ARCH_WANT_OLD_COMPAT_IPC
421 select COMPAT_OLD_SIGACTION
422 select HAVE_UID16
423 depends on MULTIUSER
424 depends on !CC_IS_CLANG
425 help
426 Select this option if you want to enable your system kernel to
427 handle system-calls from ELF binaries for 31 bit ESA. This option
428 (and some other stuff like libraries and such) is needed for
429 executing 31 bit applications. It is safe to say "Y".
430
431config SMP
432 def_bool y
433
434config NR_CPUS
435 int "Maximum number of CPUs (2-512)"
436 range 2 512
437 default "64"
438 help
439 This allows you to specify the maximum number of CPUs which this
440 kernel will support. The maximum supported value is 512 and the
441 minimum value which makes sense is 2.
442
443 This is purely to save memory - each supported CPU adds
444 approximately sixteen kilobytes to the kernel image.
445
446config HOTPLUG_CPU
447 def_bool y
448
449config NUMA
450 bool "NUMA support"
451 depends on SCHED_TOPOLOGY
452 default n
453 help
454 Enable NUMA support
455
456 This option adds NUMA support to the kernel.
457
458config NODES_SHIFT
459 int
460 depends on NUMA
461 default "1"
462
463config SCHED_SMT
464 def_bool n
465
466config SCHED_MC
467 def_bool n
468
469config SCHED_BOOK
470 def_bool n
471
472config SCHED_DRAWER
473 def_bool n
474
475config SCHED_TOPOLOGY
476 def_bool y
477 prompt "Topology scheduler support"
478 select SCHED_SMT
479 select SCHED_MC
480 select SCHED_BOOK
481 select SCHED_DRAWER
482 help
483 Topology scheduler support improves the CPU scheduler's decision
484 making when dealing with machines that have multi-threading,
485 multiple cores or multiple books.
486
487source "kernel/Kconfig.hz"
488
489config KEXEC
490 def_bool y
491 select KEXEC_CORE
492
493config KEXEC_FILE
494 bool "kexec file based system call"
495 select KEXEC_CORE
496 depends on CRYPTO
497 depends on CRYPTO_SHA256
498 depends on CRYPTO_SHA256_S390
499 help
500 Enable the kexec file based system call. In contrast to the normal
501 kexec system call this system call takes file descriptors for the
502 kernel and initramfs as arguments.
503
504config ARCH_HAS_KEXEC_PURGATORY
505 def_bool y
506 depends on KEXEC_FILE
507
508config KEXEC_SIG
509 bool "Verify kernel signature during kexec_file_load() syscall"
510 depends on KEXEC_FILE && MODULE_SIG_FORMAT
511 help
512 This option makes kernel signature verification mandatory for
513 the kexec_file_load() syscall.
514
515 In addition to that option, you need to enable signature
516 verification for the corresponding kernel image type being
517 loaded in order for this to work.
518
519config KERNEL_NOBP
520 def_bool n
521 prompt "Enable modified branch prediction for the kernel by default"
522 help
523 If this option is selected the kernel will switch to a modified
524 branch prediction mode if the firmware interface is available.
525 The modified branch prediction mode improves the behaviour in
526 regard to speculative execution.
527
528 With the option enabled the kernel parameter "nobp=0" or "nospec"
529 can be used to run the kernel in the normal branch prediction mode.
530
531 With the option disabled the modified branch prediction mode is
532 enabled with the "nobp=1" kernel parameter.
533
534 If unsure, say N.
535
536config EXPOLINE
537 def_bool n
538 depends on $(cc-option,-mindirect-branch=thunk)
539 prompt "Avoid speculative indirect branches in the kernel"
540 help
541 Compile the kernel with the expoline compiler options to guard
542 against kernel-to-user data leaks by avoiding speculative indirect
543 branches.
544 Requires a compiler with -mindirect-branch=thunk support for full
545 protection. The kernel may run slower.
546
547 If unsure, say N.
548
549config EXPOLINE_EXTERN
550 def_bool n
551 depends on EXPOLINE
552 depends on CC_IS_GCC && GCC_VERSION >= 110200
553 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
554 prompt "Generate expolines as extern functions."
555 help
556 This option is required for some tooling like kpatch. The kernel is
557 compiled with -mindirect-branch=thunk-extern and requires a newer
558 compiler.
559
560 If unsure, say N.
561
562choice
563 prompt "Expoline default"
564 depends on EXPOLINE
565 default EXPOLINE_FULL
566
567config EXPOLINE_OFF
568 bool "spectre_v2=off"
569
570config EXPOLINE_AUTO
571 bool "spectre_v2=auto"
572
573config EXPOLINE_FULL
574 bool "spectre_v2=on"
575
576endchoice
577
578config RELOCATABLE
579 def_bool y
580 help
581 This builds a kernel image that retains relocation information
582 so it can be loaded at an arbitrary address.
583 The kernel is linked as a position-independent executable (PIE)
584 and contains dynamic relocations which are processed early in the
585 bootup process.
586 The relocations make the kernel image about 15% larger (compressed
587 10%), but are discarded at runtime.
588 Note: this option exists only for documentation purposes, please do
589 not remove it.
590
591config RANDOMIZE_BASE
592 bool "Randomize the address of the kernel image (KASLR)"
593 default y
594 help
595 In support of Kernel Address Space Layout Randomization (KASLR),
596 this randomizes the address at which the kernel image is loaded,
597 as a security feature that deters exploit attempts relying on
598 knowledge of the location of kernel internals.
599
600endmenu
601
602menu "Memory setup"
603
604config ARCH_SPARSEMEM_ENABLE
605 def_bool y
606 select SPARSEMEM_VMEMMAP_ENABLE
607 select SPARSEMEM_VMEMMAP
608
609config ARCH_SPARSEMEM_DEFAULT
610 def_bool y
611
612config MAX_PHYSMEM_BITS
613 int "Maximum size of supported physical memory in bits (42-53)"
614 range 42 53
615 default "46"
616 help
617 This option specifies the maximum supported size of physical memory
618 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
619 Increasing the number of bits also increases the kernel image size.
620 By default 46 bits (64TB) are supported.
621
622config CHECK_STACK
623 def_bool y
624 depends on !VMAP_STACK
625 prompt "Detect kernel stack overflow"
626 help
627 This option enables the compiler option -mstack-guard and
628 -mstack-size if they are available. If the compiler supports them
629 it will emit additional code to each function prolog to trigger
630 an illegal operation if the kernel stack is about to overflow.
631
632 Say N if you are unsure.
633
634config STACK_GUARD
635 int "Size of the guard area (128-1024)"
636 range 128 1024
637 depends on CHECK_STACK
638 default "256"
639 help
640 This allows you to specify the size of the guard area at the lower
641 end of the kernel stack. If the kernel stack points into the guard
642 area on function entry an illegal operation is triggered. The size
643 needs to be a power of 2. Please keep in mind that the size of an
644 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
645 The minimum size for the stack guard should be 256 for 31 bit and
646 512 for 64 bit.
647
648endmenu
649
650menu "I/O subsystem"
651
652config QDIO
653 def_tristate y
654 prompt "QDIO support"
655 help
656 This driver provides the Queued Direct I/O base support for
657 IBM System z.
658
659 To compile this driver as a module, choose M here: the
660 module will be called qdio.
661
662 If unsure, say Y.
663
664if PCI
665
666config PCI_NR_FUNCTIONS
667 int "Maximum number of PCI functions (1-4096)"
668 range 1 4096
669 default "512"
670 help
671 This allows you to specify the maximum number of PCI functions which
672 this kernel will support.
673
674endif # PCI
675
676config HAS_IOMEM
677 def_bool PCI
678
679config CHSC_SCH
680 def_tristate m
681 prompt "Support for CHSC subchannels"
682 help
683 This driver allows usage of CHSC subchannels. A CHSC subchannel
684 is usually present on LPAR only.
685 The driver creates a device /dev/chsc, which may be used to
686 obtain I/O configuration information about the machine and
687 to issue asynchronous chsc commands (DANGEROUS).
688 You will usually only want to use this interface on a special
689 LPAR designated for system management.
690
691 To compile this driver as a module, choose M here: the
692 module will be called chsc_sch.
693
694 If unsure, say N.
695
696config SCM_BUS
697 def_bool y
698 prompt "SCM bus driver"
699 help
700 Bus driver for Storage Class Memory.
701
702config EADM_SCH
703 def_tristate m
704 prompt "Support for EADM subchannels"
705 depends on SCM_BUS
706 help
707 This driver allows usage of EADM subchannels. EADM subchannels act
708 as a communication vehicle for SCM increments.
709
710 To compile this driver as a module, choose M here: the
711 module will be called eadm_sch.
712
713config VFIO_CCW
714 def_tristate n
715 prompt "Support for VFIO-CCW subchannels"
716 depends on S390_CCW_IOMMU && VFIO_MDEV
717 help
718 This driver allows usage of I/O subchannels via VFIO-CCW.
719
720 To compile this driver as a module, choose M here: the
721 module will be called vfio_ccw.
722
723config VFIO_AP
724 def_tristate n
725 prompt "VFIO support for AP devices"
726 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
727 depends on ZCRYPT
728 help
729 This driver grants access to Adjunct Processor (AP) devices
730 via the VFIO mediated device interface.
731
732 To compile this driver as a module, choose M here: the module
733 will be called vfio_ap.
734
735endmenu
736
737menu "Dump support"
738
739config CRASH_DUMP
740 bool "kernel crash dumps"
741 select KEXEC
742 help
743 Generate crash dump after being started by kexec.
744 Crash dump kernels are loaded in the main kernel with kexec-tools
745 into a specially reserved region and then later executed after
746 a crash by kdump/kexec.
747 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
748 This option also enables s390 zfcpdump.
749 See also <file:Documentation/s390/zfcpdump.rst>
750
751endmenu
752
753config CCW
754 def_bool y
755
756config HAVE_PNETID
757 tristate
758 default (SMC || CCWGROUP)
759
760menu "Virtualization"
761
762config PROTECTED_VIRTUALIZATION_GUEST
763 def_bool n
764 prompt "Protected virtualization guest support"
765 help
766 Select this option, if you want to be able to run this
767 kernel as a protected virtualization KVM guest.
768 Protected virtualization capable machines have a mini hypervisor
769 located at machine level (an ultravisor). With help of the
770 Ultravisor, KVM will be able to run "protected" VMs, special
771 VMs whose memory and management data are unavailable to KVM.
772
773config PFAULT
774 def_bool y
775 prompt "Pseudo page fault support"
776 help
777 Select this option, if you want to use PFAULT pseudo page fault
778 handling under VM. If running native or in LPAR, this option
779 has no effect. If your VM does not support PFAULT, PAGEEX
780 pseudo page fault handling will be used.
781 Note that VM 4.2 supports PFAULT but has a bug in its
782 implementation that causes some problems.
783 Everybody who wants to run Linux under VM != VM4.2 should select
784 this option.
785
786config CMM
787 def_tristate n
788 prompt "Cooperative memory management"
789 help
790 Select this option, if you want to enable the kernel interface
791 to reduce the memory size of the system. This is accomplished
792 by allocating pages of memory and put them "on hold". This only
793 makes sense for a system running under VM where the unused pages
794 will be reused by VM for other guest systems. The interface
795 allows an external monitor to balance memory of many systems.
796 Everybody who wants to run Linux under VM should select this
797 option.
798
799config CMM_IUCV
800 def_bool y
801 prompt "IUCV special message interface to cooperative memory management"
802 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
803 help
804 Select this option to enable the special message interface to
805 the cooperative memory management.
806
807config APPLDATA_BASE
808 def_bool n
809 prompt "Linux - VM Monitor Stream, base infrastructure"
810 depends on PROC_SYSCTL
811 help
812 This provides a kernel interface for creating and updating z/VM APPLDATA
813 monitor records. The monitor records are updated at certain time
814 intervals, once the timer is started.
815 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
816 i.e. enables or disables monitoring on the Linux side.
817 A custom interval value (in seconds) can be written to
818 /proc/appldata/interval.
819
820 Defaults are 60 seconds interval and timer off.
821 The /proc entries can also be read from, showing the current settings.
822
823config APPLDATA_MEM
824 def_tristate m
825 prompt "Monitor memory management statistics"
826 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
827 help
828 This provides memory management related data to the Linux - VM Monitor
829 Stream, like paging/swapping rate, memory utilisation, etc.
830 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
831 APPLDATA monitor record, i.e. enables or disables monitoring this record
832 on the z/VM side.
833
834 Default is disabled.
835 The /proc entry can also be read from, showing the current settings.
836
837 This can also be compiled as a module, which will be called
838 appldata_mem.o.
839
840config APPLDATA_OS
841 def_tristate m
842 prompt "Monitor OS statistics"
843 depends on APPLDATA_BASE
844 help
845 This provides OS related data to the Linux - VM Monitor Stream, like
846 CPU utilisation, etc.
847 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
848 APPLDATA monitor record, i.e. enables or disables monitoring this record
849 on the z/VM side.
850
851 Default is disabled.
852 This can also be compiled as a module, which will be called
853 appldata_os.o.
854
855config APPLDATA_NET_SUM
856 def_tristate m
857 prompt "Monitor overall network statistics"
858 depends on APPLDATA_BASE && NET
859 help
860 This provides network related data to the Linux - VM Monitor Stream,
861 currently there is only a total sum of network I/O statistics, no
862 per-interface data.
863 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
864 APPLDATA monitor record, i.e. enables or disables monitoring this record
865 on the z/VM side.
866
867 Default is disabled.
868 This can also be compiled as a module, which will be called
869 appldata_net_sum.o.
870
871config S390_HYPFS_FS
872 def_bool y
873 prompt "s390 hypervisor file system support"
874 select SYS_HYPERVISOR
875 help
876 This is a virtual file system intended to provide accounting
877 information in an s390 hypervisor environment.
878
879source "arch/s390/kvm/Kconfig"
880
881config S390_GUEST
882 def_bool y
883 prompt "s390 support for virtio devices"
884 select TTY
885 select VIRTUALIZATION
886 select VIRTIO
887 help
888 Enabling this option adds support for virtio based paravirtual device
889 drivers on s390.
890
891 Select this option if you want to run the kernel as a guest under
892 the KVM hypervisor.
893
894endmenu
895
896config S390_MODULES_SANITY_TEST_HELPERS
897 def_bool n
898
899menu "Selftests"
900
901config S390_UNWIND_SELFTEST
902 def_tristate n
903 depends on KUNIT
904 default KUNIT_ALL_TESTS
905 prompt "Test unwind functions"
906 help
907 This option enables s390 specific stack unwinder testing kernel
908 module. This option is not useful for distributions or general
909 kernels, but only for kernel developers working on architecture code.
910
911 Say N if you are unsure.
912
913config S390_KPROBES_SANITY_TEST
914 def_tristate n
915 prompt "Enable s390 specific kprobes tests"
916 depends on KPROBES
917 depends on KUNIT
918 help
919 This option enables an s390 specific kprobes test module. This option
920 is not useful for distributions or general kernels, but only for kernel
921 developers working on architecture code.
922
923 Say N if you are unsure.
924
925config S390_MODULES_SANITY_TEST
926 def_tristate n
927 depends on KUNIT
928 default KUNIT_ALL_TESTS
929 prompt "Enable s390 specific modules tests"
930 select S390_MODULES_SANITY_TEST_HELPERS
931 help
932 This option enables an s390 specific modules test. This option is
933 not useful for distributions or general kernels, but only for
934 kernel developers working on architecture code.
935
936 Say N if you are unsure.
937endmenu